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Protractor
01
分度器, 角度計
a measuring instrument used to measure and draw angles
What is a "protractor"?
A protractor is a tool used to measure and draw angles. It is usually a flat, semicircular or circular device marked with degree measurements from 0 to 180 or 360. The protractor has a straight edge for aligning with a line or point, while the curved side is used to measure the angle between two meeting lines. Protractors are commonly used in geometry, drafting, carpentry, and construction to ensure accurate angle measurements for various projects. They come in different sizes and types, including digital versions for easier reading.
protractor
n
tractor
n
例
She used a protractor to measure the angle of the triangle accurately.
To find the measure of an angle, one can use a protractor, which displays degrees.
To measure accurately, the protractor must be held perpendicular to the edge of the board.
In the geometry class, students learned how to identify and measure obtuse angles using a protractor.
The geometry teacher demonstrated how to use a protractor and triangle to measure angles in the classroom.
